Strainer-cylinder for wood-pulp and cellulose



H. E. WAGNER.

STRAINER cvLlNDER Fon wool) PULP AND CELLULJSE.

APPLICATION FILED AUG.9.1920.

1,385,340. Piltlld July 19, 1921.

2 SHEETS-SHEET I.

I/zyf *I l l R. E. WAGNER.

STR/UNER CYUNDER F011 Woon PULP AND CELLULOSE.

APPLICATION FILED AUG.9| i920.

1,335,340, .Patented July 19,1921.

2 SHEETS-SHEET 21 UNITED STATES PATENT OFFICE.

' RUDOLF ERNST WAGNER, OF KARLSTAD, SWEDEN, ASSIGNOR T AKTIEBOLAGETKARLSTADS HEKANISKA. VERKSIADS, OF KARLSTAD, SWEDEN, A MANUFAC- TUBINGCOPANY F SWEDEN'.

BTBAINERfC'YLINDER FOR WOOD-PULP AND CELLULOSE.

To all whom it may concern.'

Be it known that I, RUDOLF ERNST WAG- Nsu, a subject of the Kin ofSweden, residing at Karlstad,.in the Kingdom of Sweden, have inventedanew and useful Improve ment in Strainer-Cylinders for Wood-Pulp andCellulose, for which I have filed applications in Sweden, March 5,1919,#1049/19; Finland, June 21, 1920, #397/20; Norway, June 22, 1920,#20,647 Germany, June 24, 1920; Austria, June 24, 1920, and of which thelfollowing is a specification.

The present invention relates to an improvement in strainer cylinders orrolls for wood-pulp and cellulose, such. as are used in the rotarywire-part of wet-machines, in pulp-vate, thickeners for pulp,water-extractors, and collectors for stuff. The invention relates tothetype of such straining cylinders which consist of a rotary cylinderdivided into cells or compartments and surrounded by a rotary strainercloth, andv which are arranged in such manner that the supply of thematerial orr pulp onto the strainer cloth takes lace at a ortion i itsupward moving su ace over t e horizontal plane through the axis of thecylinder.

The 'invention'is princi ally characterized by this that in the interlorofV the cylinder within the cells a stationary suction box is providedwhich boxl is arranged in such manner that during the rotation of thecy1inder those cells over which the pul is suppliedA onto the strainercloth, are at rst shut off from the'suction box, and only after a filteror straining layer has been formed over these cells by natural straininsaid cells are ut into communication `wit the suction ox owing to therotation of the cylinder. The suction chamber is preferably arran' ed insuch manner that the said cells over which the pulp is Supplied onto thestrainer cloth, are at rst completely closed by the wall of the suctionbox,v and are afterward moved duringl the rotation of the cylinder to anSpecification of Letters Patent.

Patented July 1e, raar.

Application led August 9, 1920. Serial No. 402,376.

The cyl- 6 dividingI the interior of' the box into two chambers. tionchamber, and has at lts top an opening -of such extension that theuppermost cells in the upper fourth moving upward and the reater portionof the number of cells in t e upper downward moving fourth of thecylinder, approximately to the point on the periphery of the cylinder atwhich the web of pulp gathered on the strainer cloth around the cylinderis removed from the cylinder in suitable manner for instance by means ofa removing roll or by blast air, are in communication with said suctionchamber. The smaller chamber 8 is provided at its top with an opening 9,as shown in Fig. 2.* The said opening is located in such manner that thecells arrive opposite the same only after they have moved a certaindistance upward in the pulp in the pulp container 1. During the firstperiod of movement upward through the pulp the cells are thus closed andseparated from the chamber 8 by the Wall 10 of said chamber. The shaft11 of the cylinder is supported by bearing frames 12 which also supportthe ulp container 1. The suction box 5 is ournaled 4on the shaft 11 andis maintained 1n position by means of the bolts 13. The cylinder isrotated by means of a worm gearing 14.

When during the rotation of the cylinder the vcells enter the lowerportion of the pulp container ,1, the pulp settles on the strainer cloth4 over the cells, and the water strains through the strainer cloth intothe cells and remains in the cells. In this manner the fibers of the pulare at first steadily and slowly deposlte on the strainer cloth. When'the cells have been moved u ward opposite the o ening A9 of the cham r8, the water flows rom the cells into sald chamber, whereby morev waterfilters through the strainer cloth onto which more pulp becomesdeposited. In this manner there has now lbeen formada fiber layer orafilter of ber The larger chamber 7 is the sucon the-strainer cloth, sothat-When after- Ward the 'cells arrive in front of the opening of thesuction chamber 7 and are thus subjected to the suction said fiber layerserves aS a filterA for collecting still more pulp fibers. A

The cells thus being separated by the Wall 10 from the drain or outletchamber 8, when entering the pulp container, and there being no outletfrom the cells, the straining or filteringI through of the Water will atiirst be checked and take place very. slowly, and the risk of'the fibersbeing brought `along by the Water will thus be very small.

When a liber layer has been formed outside f the cells these will arriveto. the outlet 9',

` box located in the interior of said cylinder .the pu struction isattained so that the width of the entire machine does not become greaterthan the length of the cylinder.

The water is drained from the suction chamber 7 through a pipe 15 andthe water in the chamber 8 is drained through a tube 16.

I claim: e

1. In a strainer cylinder for Woodpulp and cellulose, the combination ofa pulp con tainer, a rotary'cylinderdivided into cells, a strainer clothsurrounding said cells and forming the outer surface of said cylinder,an upward rotating portion of said strainer cloth above the horizontalplane through the axis of said cylinder forming one wall of said pulpcontainer, a stationary suction within said cells' and having a suctionopening opposite the upperpart of said portion of the strainer clothforming a wall of said container, and a wallopposite the lower parto'ffsaid portion of the strainer cloth, said iwall `@forming astationary bottom forthe cells covered by said part, for the purposethat during the rotation of the cylinder the cells moving into the pulpcontainer shall at first be closed and shut off from the suction box andafterward vplaced into communication with said suction box when a filterAlayer has been formed on the strainer cloth over said cells by naturalstraining.

2. In a strainer cylinder for Wood-pulp and cellulose, the combinati-onof a pulp conn tainer, a rotary cylinder divided into cells, astrainercloth surrounding said cells and forming the outer surface ofsaid cylinder, an upward rotatin portieri oi said strainer cloth abovethe horizontal plane through the axis of said cylinder forming one Wallof said` pulp container, a Wall opposite the lower part of said portionof the strainer cloth, said wall forming a stationary bottoni forthecells covered by said part, a drain conduit opposite an intermediatepart of said portion of the strainer cloth, and a stationary suction boxlocated in the interior of said cylinder Within said cells and having asuction openin opposite the upper part of said portion o the strainerclot 1.

3. In a strainer cylinder for wood-pulp and cellulose, the lcombinationof a pulp container, a rotary cylinder divided into cells, a strainercloth surrounding said -cells and forming the outer surface of saidcylinder, an upward rotating portion of said strainer cloth above thehormontal plane through the axis of said cylinder forming one wall ofsaid pulp container, a stationary suction box located in the interior ofsaid cylinder Within said cells, the Wall of said suction box lforming astationary bottom for the cells ,covered by the lower part of saidportion of the strainer cloth forming a wall of said container, apartition in said suction box dividing the saine into two chambers, oneofsaid chambers having an opening opposite the cells covered by theintermediate part of said portion of the strainer cloth, a drain conduitconnected to said chamber, the other chamber having an opening oppositethe cells covered by the upper part ofsaid portion of the strainercloth, and means for producing suction in said second chamber.

p RUDLF ERNST WAGNER.

